Insulating-felt.



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ALVIN EHRET, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO EHRE'I MAG- NESIA MANUFACTURING COMPANY, OF PHILADELPHIA, IENNSYLVANIA, A COR- .v

PORATION 0F PENINSYIJVANIA.4

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Specification of Letters Patent.

Patented July 27, 1915.

Application filed April 17, 1914-.. Serial 110,832,561.

lation to laminated insulating felt for use,

for instance, in connection with the construction of steel railway' cars. y

As manufactured lat present, laminated insulating felt used for the\above purpose, is very heavy, is quite expensive and isvunsatisfactory in use for the reason that it is relatively rigid in nature and consequently when used to cover conveXed or concaved surfaces, breaks or cracks during the bending and fitting thereof. In addition to this, the vibration of a car, iitted/ with such felt, serves to loosen and disconnect the various layers of material.

The principal object of the present invention is to overcome the above described disadvantageous features and provide as a new article of manufacture, a laminated insulating feltv of light, strong, durable, eiiicient and comparatively inexpensive construction which is pliable and yielding in nature and which although subjected to vibration will maintain in Vinterlocked position its complemental layers.

@ther objects will appear hereinafter.

The invention, generally stated, consists Vof the improvements hereinafter described and finally claimed.

The nature, characteristic features and scope of the invention will be more fully understood from the following description taken in connection with the accompanying drawings forming part hereof and in which:

Figure 1, is a plan view of a piece of laminated insulating felt embodying the invention, Fig. 2, is an edge view thereof, Fig. 3, is a View in cross section, but drawn to an enlarged.A scale, and Fig. 4, is a sectional view of a modified form of insulating felt.

Referring now to the drawings, and more particularly to Figs. 1, to 3, inclusive, the laminated insulating feltl of the invention, briefly stated, is made up of superimposed adhering layers of lire resisting and tem-' perature resisting materials having fan adherlng textile insert or binder between adjacent, combined layers, the whole structure being indented throughout its length, breadth and thickness. The outer layers are designated 10, andcomprise sheets of iire resisting material, for instance, asbestosfelt. Adhering to these layers are inner layers 11, of material possessing heat and cold resisting properties, as for instance, wool-felt. ;As many \voolfelt layers may be emplpyed as desired. Between adjacent layers of wool-felt there is interposed a thin, pliable, textile insert or binder 12, as

light weight canvas, cotton, duck or the like.

These materials are caused to adhere one with another preferably by the application of a silicate of soda preparation. The adhering materials are passed through suitable apparatus for indenting as 13, the entire structure, considered in length, breadth and thickness. The indentations have staggered relation with one another considered in plan. rIhis indenting process serves to compress the various adhering materials together and' relatively interlock them one With another. In this connection, it is to be observed that by reason of this interlocking structure, very little adhesive is required and further serves to prevent disconnecting of the layers when vibration is present in a structure to which the felt is applied. By the above construction of insulating felt, it may be further mentioned that the textile insert or binder provides tensile I strength and the multiplicity of staggered indentations provide for great pliability or yielding qualities of the felt as a whole.

Referring now to Fig. 4, a slightly modilied form of insulating felt is disclosed. Instead of forming the various layers or plies together with adhesive, the individual strips of material are first indented, then assembled, and then secured together by stitching as 14. In this connection, it may be remarked that the indented portions do not necessarily interlock.

In the tting of the above described insulating felt to curved surfaces, for instance, in railway passenger cars `of the steel type, this pliability or yielding quality serves to permit of the insulating felt readily adapt- 2 n I y. 1,148,447.

tion has been restricted tothe use of said insulating material in connection with steel railway equipment, for which it has been particularlydesigned obviously it may be put tol other uses.

What I claim is:

1. As a new article of manufacture an insulating felt embracing superimposed layersv of` material possessing combustion resisting and heat resisting qualities, a textile binder `applied. toat least one of said layers said materials all beingadhesively held together and the entire structure being profusely` indented so as to relatively. interlock the various materials one with another by reason of the nesting indented portions` 2. As a new articlev of manufacture an insulating felt embracing superimposed layers yof asbestos-felt and wool-felt, a textile binder as canvas applied to at least one ofsaid layers said materials being adhesively held together and the entire structure being profusely indented so as torelatively interlock the various materialsvonefwith another by reason of the nesting indented portions. y 3. As a new article of manufacture an insulating felt embracing outer pieces of asbestos-felt, inner pieces of wool-felt and a textile binder, as canvas, interposed between adjacent pieces of said wool-feltall of said parts being adhesively secured together by a silicate of sodal preparation and the entire structure being profusely indented to relatively interlock the various materials together.

4:. As a new article of manufacture an insulating felt embracing superimposed layers of material possessing combustion resisting and heat resisting qualities at least lone of which layers is provided with a tex- .tile binder, said materials all being profusely indented so that at least some of the adjacent layers have interlocked relation one with another by reason of the nesting indented portions and independent means for securing the layers together.

ALVIN M. EHRET.

' Witnesses:

BENJ. T. CONNER, Jr., WILLIAM J. JACKSON. 

